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| 基准船型尾流场TRPIV实验研究 |
| TRPIV experimental study on stern flow field of reference ship type |
| 投稿时间：2024-02-27 修订日期：2024-04-29 |
| DOI： |
| 中文关键词: 粒子图像测速 基准船型 艉流场 湍流特性 涡结构 |
| 英文关键词:particle image velocity JBC reference ship Stern flow field turbulence characteristic vortex |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）,中国博士后科学基金,中德合作研究小组基金项目(项目号：GZ1575),工业信息化部高技术船舶项目（批文：[2019]360） |
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| 中文摘要: |
| 通过实验对船舶尾流场进行测量可以为船舶的优化设计和数值仿真提供数据支撑。以日本散货船（Japan Bulk Carrier, JBC）基准船型为原型，采用高时间分辨率粒子图像测速技术（Time-resolved Particle Image Velocimetry，TRPIV）在低湍流度回流式风洞中对流法向尾流场进行了精细测量。重叠模型缩比为1：150，基于船模垂线间长L_PP的雷诺数为2.56×10^6，获得了设计工况下尾流场的流法向平均速度场、雷诺应力、瞬时涡量场，并且通过多个流法向平均速度场构建了其展法向剖面的平均速度场。测量结果表明了尾流场中存在大范围的低速区，在展法向视场中低速区呈明显的“钩状”分布，尾流场中具有明显的较大涡结构特征，并直接影响尾流场的速度分布。涡结构主要存在于螺旋桨凸台的上下两侧，并随视场的外移法向位置逐渐升高，大范围的涡结构中含有许多小的涡结构。最后通过本征正交分解（Proper orthogonal decomposition, POD）的模态能量分布和大小尺度速度场重构结果，尾流场中存在不同尺度的结构，在螺旋桨凸台的下侧大尺度结构对湍流能量的贡献较大。 |
| 英文摘要: |
| The measurement of the stern flow field of the ship through experiments can provide data support for the optimal design and numerical simulation of the ship. based on the JBC (Japan Bulk Carrier), the longitudinal stern flow field is accurately measured by using time-resolved particle image velocimetry (TRPIV) in a low turbulence return flow wind tunnel. The scale of double deck ship model is 1:150, and the Reynolds number based on the length between perpendiculars is 2.56×10^6, The longitudinal average velocity field, Reynolds stress and instantaneous vorticity field of stern flow under the design condition are obtained, and the transverse average velocity field is constructed from the longitudinal average velocity field. The measurement results show that there is a wide range of low speed zones in the stern flow field, and the low speed zone shows an obvious "hook" distribution in the transverse field of view. The vortex structure mainly exists on the upper and lower sides of the propeller boss, and gradually rises with the outward shift of the field of view, and the large range of vortex structure contains many small vortex structures. Finally, through the modal energy distribution and the velocity field reconstruction results of Proper Orthogonal Decomposition (POD), it is found that there are different scale structures in the stern flow field, and the large-scale structure on the lower side of the propeller boss contributes more to the turbulent energy. |
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